Adjustable stroke press



ADJUSTABLE STROKE PRESS I I I I IN V EN TGR.

Sept. 3, 1935. w. KLocKE 2,013,468

ADJUSTABLE STROKE PRESS Filed April 14, 1934 Sheets-Sheet 2 ggg 4 Q H1 j Y# *w @ist R ,MXN

INVENTOR.

m'ZZ/amZZocke BY Patented Sept. 3, 1935 UNITED PATENT OFFFECE 0132.458 ADJUSTABLE STROKE PRESS .Wil'limlloke Wodhayen, N. Y- Application April 14, 1934, Serial No. 720,551 t feol'aiins; (of '744571) This invention relates to presses orvthe like, and more particularly to the slide-actuating mechanism thereof, and provides' improvements therein 5 It has heretofore been proposed to provide in a press means for adjusting the stroke'ofthe slide, so that a single press, insteadof having a stroke of but one length, may be made to have more than one length of stroke. Thepress-user with such a press may select one of a number of stroke-lengths permitted by "the adjustmentmeans which is best suitedto theV work which'he wishes to do from timeto time, and 'thusenjoy an advantage comparable to having at his lcommand a number of presses having 4c liifeient strokes.

The means previously employed usually require substitution of parts, or dis-assembling some part or parts of the'press to make the adjustment.V many, the constructions are not'well conceived from the standpointofstanding-up undertthe working strains encountered in press-operation, and are not amenable to ready adjustment.l

Presses are customarily furnished with -brakes and with a positiveclutch of one type or another by which the movementl of the slide is stopped on the completion of a complete stroke, and started to complete another stroke. 'The clutch and brake are usually timed to` stop' and start the slide from the top of the stroke. The principal advantages of this are; that" the maximum clearance between the punch (carried by the slide) and the die (carried bythe bed) is provided at the time the slide is at rest so .thel part of the metal forced into the die by the punch may be lifted out of the die withthe'maximum clearance between the punch and the article which has been lifted out of thedie; and that the weight of the slide 4and connections when 40 stopped in the top-position does not act against I) ing mechanism bywhich the stroke may be adjusted and by which the stopping position,4 for each position of adjustment of the stroke-adjustment means, remains at the top ofthe stroke of the slide.

y The invention further provides a slide actuating mechanism by'which" adjustments ofthe stroke-adjustment means may be effected without substituting dis-assembling or'vdisturbinga'ny part of the press or of the sndeactuating meehv anSm. v

`- normall'yheld vinjposition to engage the `tail 32 l on thel rollingkey by av springjtg.

The invention `further provides a slide actuating mechanism in'v which the strains on the working stroke are transmitted by lcompression through the adjustmentmeans to the shaft; and in which-said adjustment means receive and 5 transmit the working-strains through broad surfaces with a considerable factor of safety against shearing in the parts which receive and transmit said strains; and in which the adjustment means' are of relatively simple construction, and 10 in which the stroke-adjustments'may be 'quickly *l and readily'made'. f

An embodiment ofthe invention is illustrated the accompanying drawings, in which:

'Figjlis a side elevation of a press (with the 15 frame shown in dotted lines and the fly-Wheel vlorriit'ted) embodying my invention. -^Fig. 2 is a ,transverse View, partly in side ele- U vati'on,l and partly in section, ofthe slide-actuating mechanism, the slide` .and connecting-rod be- 'ingl omitted: l 20 Fig. 3 is a front view, partly in elevation and partl y"section, ofthe 'parts'shown in Fig. 1. '.Fig. 4 is a detail'view looking down through thehtop of thel strap and into the sockets ofthe partsby wnichfthe adjustments are effected. .25 {Referring to said Idrawings, numeral I0 desighates the side frame-cfa press, I2 a reciprocating slide (on which a punch is"l customarily mounted) I4 vaushaft, I6 an eccentric mounted thereon and drivenv thereby, I8 the connecting-rod betweenl 'mechanism- Ihe clutchjZ may be of the rollingkey type, as shown-'and comprises a key 3 turning inuafrecess in the shaft and having a tail 32 by wljiich'd'itV is turned into dis-engagingposition. 4A spring (not shown) presses the key into the- -f'engaging position. A clutch of this type is dis- 'elo'sedjin'lfatent- #710,199. As here shown the clutchioperating mechanism comprises a jdog 33 l I 40 designates the'treadleerod by which the dog 38 is `'rrioved vk'iutfof"the path of the tail 32, whereupon 'thekey-B: may turn and enter a notch in the A driving member, thereby coupling V*the driving member" and' shaft I'' so that the shaft I4 is 50 turned and actuates the slide. Upon the release ofj the treadle-rod Ml, thedog 38 moves into posil"tion to vengage the tail 32 and disengage the clutch Yby' turning key-3l).V

According to my invention, the eccentric I6 is provided with a slot 44 through which the shaft I4 passes. This slo-t 44 is somewhat elongated, and, to the end that the clutching and declutching may take place at the top position of the slide I2 irrespective of the adjustment of the stroke, the said slot 44 is made so that the center vC of the eccentric I6 is movable along a radius or linewfrom the shaft-center CS from one position of adjustment to another. The eccentric centers and the shaft center remain in one straight line in all positions of adjustment of the eccentrics.

The part 46 of the shaft I 4 which passes through the eccentric is preferably enlarged to strengthen it, and made eccentric with its center between the centers C and CS. A torque-transmitting connection is also preferably provided between shaft I4 and the eccentric I6, and for thispurpose the part 46 of the shaft may be provided .with parallel vflat faces 48, 49 which engage flat sides provided on the eccentric facing the slot 44.

Y The eccentriccenter C is movable toward and v is provided. The screw 55 preferably has a double bearing on the shaft I4. The part 46 of the shaft is provided with a recess 55 and may be provided with threads to engage external threads on the screw 5I), thus providing one of said bearings. The screw 50 is also preferably provided with a threaded socket 58 in which fits a threaded plug 60, which may be forced against the bottom of recess 55, so that the screw 5I) may also bear on shaft I4 through said plug. The plug til when forced against the bottom of recess 55, jams the internal and external threads on screw 56 and thus acts as a means to lock the screw 5B in its adjusted positions.

Onlaboring part of the working stroke, in which the shaft I4 and eccentric I6 move through an arc from plus to 180 from the position shown in Figs. 1, 2, and 3, the strains are borne and transmitted from the eccentric I6 to the screw 50 through broad areas of contact between the head of the screw and the underside 52 of the eccentric; Vfrom the screw 5t to the shaft I4 through ample threads in the recess 55, and also through the plug 6I) and ample threads in the socket 58. The strains are transmitted Vfrom the eccentric I6 to the shaft I4 by compression, and the parts are readily susceptible to being formed with a large factor of safety against sheaving strains. The torque-transmitting connection between the shaft and the eccentric also bears a with an opening S8 which may be made to match the opening 65 when it is desiredto turn the screw 50 and plug 65 to effect adjustments of the stroke.

10 is a screw-plug for closing the opening 68.

The screw 50 and associated parts are within the dimension of the eccentric, and by the means described manipulation of the requisite parts for jturbingj Avor disassembling orv substituting Ainternal-nut 54 being conveniently formed in this neck-portion. The neck may be grooved, as indicatedV at 'I5 and the wall of the opening 56 may be provided with a matching groove 11 forming part of a hole 'I9 extending laterally through the eccentric. A pin (or pins) Bil occupying the grooves l5 and 'Il retains the screw 5B against longitudinal movement with relation to the eccen- ,tric. Y A threaded .collar A32 Vengaging correspond- "ingthreads 'in the eccentric 'may be provided to provide a bearing for the top' of the reducedneck-portion of screw 55 and thus increase the bearing-area-between theV screw and the eccen.

The recess 55 is made of` suicient depth, so that clearanceis provided'between the highest point of the screw 55 (when at thebottom of socket 55) and the underside of the eccentric within the slot 44, and provision thereby vmade for sliding the eccentric laterally overthe shaft and screw 50 in assembling the parts.

Removable collars 9E, 9i act as checks vat each side ofthe eccentric 50 to restrain lateral dis-..

placement.

By arranging the eccentric center C above the .shaft center CS in the position of -the parts shown in Fig. 1, where lthe shaft I4 is in the top of the stroke will correspond to the clutch engaging and disengagingV position for each po- Asitionaof adjustment of the stroke.

Operation Toadjustthe stroke of the slide I2, the parts are broughtto the positionshown in Figs. 1, 2,

`and 3 Vof the drawings. YThe screw plug 'I0 is removed, and the wrench inserted through `the opening 58 and through the internal-nut 64 into the internal-nut 65,'and the screw-plug 6H turned to backit off fromits seat against'the bottom of the recess 55. AThe Wrench is' thenwithdrawn and another wrench of the size to fit the internal! nut .64..on the screw 55 is inserted throughY the opening '68, and the screw 5U. turned in a direction to bring the eccentric center C toward the shaft-center CS, or, vice versa. j When Ythe ec-v ,centric has been shiftedto the desired'extent with relation to the 'shaft center, the screw-plug 50 is again forced down against "its seat at the Y bottom'of the socket55 jamming the threads Y between the plug; 6i! and thescrew 50 and between the latter andthe threads in recess 55. Thescrew Vlilis thusvsecurely fastened in its ,'adjustedigposition As heretofore explained, the clutch'engaging and ,disengagingposition 'remains at the top-off the-stroke positionof the vslide l2 for each posif tion jofjadjustment` ofthe stroke adjusting means,

and the adjustments may be affected without disany of the press parts. A. Y

The invention may receive other embodiments than that herein specifically illustrated and described.

What is claimed is:

1. In a press or the like, a. reciprocating slide, and actuating mechanism therefor, comprising an eccentric, a shaft passing through said eccentric having a threaded recess therein, said eccentric being slotted in such manner that its center is adjustable toward and from the shaft center, and a screw within said eccentric engaging* said threaded recess for fastening said eccentric in its adjusted positions, said screw having a threaded socket therein, and a threaded plug engaging said socket and having a seat on the bottom of the recess in said shaft.

2. In a, press or the like, a reciprocating slide, and actuating mechanism therefor, comprising an eccentric, a shaft passing through said eccentric having a threaded recess therein, said eccentric being slotted in such manner that its center is adjustable toward and from the shaft center, and a screw within said eccentric engaging said threaded recess for fastening said eccentric in its adjusted positions, said screw having a threaded socket therein, and a threaded plug engaging said socket and having a seat on the bottom of the recess in said shaft, said screw and plug each having internal nuts in alinement, and said eccentric having an opening through its peripheral face also in alinement with said internalnuts.

3. In a press or the like, a reciprocating slide, and actuating mechanism therefor comprising an eccentric, a shaft having parallel flat faces thereon, said eccentric having a slot therein of a width equal to the distance apart of said flat faces on the shaft, said shaft passing through the slot in said eccentric with the flat faces thereon in contact with the sides of said slot, said eccentric being spaced from said shaft to a limited extent at the ends of the slot, in such manner that its center is adjustable toward and from the shaft center, torsion being transmitted by said shaft to said eccentric through said flat faces, and a screw radially of the shaft center for fastening said eccentric in its adjusted positions, said shaft having a threaded recess therein also radially of the shaft center, said screw engaging the threads of said recess and projecting within the slot in the eccentric to provide a support through which radial stresses are transmitted from the eccentric to the shaft.

4. In a combination according to claim 3, said shaft being enlarged at the part within the eccentric and offset at the recess to provide additional metal for the formation of the said flat faces and recess.

5. In a combination according to claim 3, said screw having a reduced neck provided with an internal nut, said eccentric having a hole therein providing a socket for said neck and an opening for access to said internal nut.

6. In a combination according to claim 3, said screw having a reduced neck provided with an. internal nut, said eccentric having a hole therein providing a socket for said neck and an opening for access to said internal nut, said recess being of such depth and said slot being of such length that the high point of the screw will clear the underside of the eccentric within said slot when the shaft and eccentric centers are most widely apart.

WILLIAM KLOCKE. 

